2017 Multi-University Training Contest 4 hdu 6069

HDU 6069

思路：

AC代码：

#include "iostream"
#include "string.h"
#include "stack"
#include "queue"
#include "string"
#include "vector"
#include "set"
#include "map"
#include "algorithm"
#include "stdio.h"
#include "math.h"
#pragma comment(linker, "/STACK:102400000,102400000")
#define ll long long
#define endl ("\n")
#define bug(x) cout<<x<<" "<<"UUUUU"<<endl;
#define mem(a,x) memset(a,x,sizeof(a))
#define mp(x,y) make_pair(x,y)
#define pb(x) push_back(x)
#define ft (frist)
#define sd (second)
#define lrt (rt<<1)
#define rrt (rt<<1|1)
using namespace std;
const long long INF = 1e18+1LL;
const int inf = 1e9+1e8;
const int N=1e6+10000;
const ll mod=998244353;

ll l,r,k,num[N],ans[N];
ll p[N];
bool isprime[N];
ll get_prime(){
    ll c = 0,n=N-1000;
    memset(isprime, true,sizeof(isprime));
    isprime[1] = 0;
    for(ll i=2; i<=n; i++){
        if(isprime[i]){
            p[++c] = i;
            for(ll j=i*i; j<=n; j+=i) isprime[j] = false;
        }
    }
    return c;
}

int main(){
    ll c=get_prime(); //for(int i=1; i<=100; ++i) cout<<p[i]<<" ";
    int T=15,f;
    scanf("%d",&T);
    while(T--){
        //l=1e12-1e6, r=1e12,k=1e6;
        scanf("%lld %lld %lld",&l, &r, &k);
        for(ll i=l; i<=r; ++i){
            num[i-l+1]=i;
            ans[i-l+1]=1;
        }
        for(ll j=1; j<=c && p[j]<=r; ++j){
            if(l%p[j]==0) f=1;
            else f=(l/p[j]+1)*p[j]-l+1;
            for(ll t=f; t<=r-l+1; t+=p[j]){
                ll d=0;
                while(num[t]%p[j]==0){
                    num[t]/=p[j];
                    d++;
                }
                ans[t]=(ans[t]*(((d*k)%mod)+1))%mod;
            }
        }
        ll anss=0;
        for(ll i=1; i<=r-l+1; ++i){
            if(num[i]!=1) ans[i]=(ans[i]*(k+1))%mod;
            anss=(anss+ans[i])%mod;
        }
        printf("%lld\n",anss);
    }
    return 0;
}